Re-visit the website where the file was originally listed to see if there is a description or a "Readme" file in the first part ( part1.rar ).
Could you clarify or what the broader subject of your research is?
If you have encountered this file on a file-sharing site or received it from an unknown source, please be aware of the following:
If this file is related to a specific course or a professional project you are working on, I recommend checking the following:
This is a proprietary archive format used for data compression and error recovery. A .part3 designation means it is the third segment of a larger file that has been split into multiple pieces for easier uploading or storage.
If this was provided in an academic setting, the "BKAD" prefix may match a course code in your university's portal.
In a corporate environment, search your company's internal wiki or file server for "BKAD22" to find the associated project.